Effects of Low-Angle Grain Boundaries on the Yield-Strength Ratio of High Grade Pipeline Steels
Orientations distribution between grains of two high grade pipeline steels were investigated by electron back-scattered diffraction (EBSD). Then the percentage of low-angle grain boundaries was studied qualitatively to analyze the effect of low-angle grain boundaries on the yield-strength ratio of high grade pipeline steels. From the mode of coordinate deformation and the ability to resist deformation by the grain boundaries, the results show that when the effective grain size are almost the same, the pipeline steel which has the smaller percentage of low-angle grain boundaries, the larger difference between the yield strength and tensile strength, which makes the yield-strength ratio of pipeline steel lower.
D. Y. Xu and H. Yu, "Effects of Low-Angle Grain Boundaries on the Yield-Strength Ratio of High Grade Pipeline Steels", Advanced Materials Research, Vols. 168-170, pp. 1581-1585, 2011